The IBM BladeCenter AMD LS42 Multiprocessor Expansion Unit is an optional expansion unit for single-wide models of the BladeCenter LS42 Type 7902 blade server.
The Multiprocessor Expansion Unit (MPE) provides up to eight additional dual-inline memory (DIMM) connectors, and two additional microprocessors. It also supports the installation of standard-form-factor, small-form-factor, high-speed-form-factor, or combination-form-factor I/O-expansion cards. An additional expansion unit, such as the BladeCenter PCI I/O expansion unit, can also be installed.
See the Installation Guide for the IBM BladeCenter AMD LS42 Multiprocessor Expansion Unit.
Go to http://www.ibm.com/systems/bladecenter/hardware/expansion/ for more information about expansion units.